Lifting-jack.



PATENTED JUNE 23, 1908. F. G. BUTLER & E. 000K.

LIFTING JACK.

APPLICATION FILED AUG, 21, 1907.

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49W J 04K No. 891,523. PATENTED JUNE 23, 1908. F. 0. BUTLER & E. 000K.

LIFTING JACK.

APPLIOATION FILED AUG. 21, 1907.

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WI b1 eases No. 891,523. PATENTED JUNE 23, 1908. 1-". 0. BUTLER & E. 000K.

LIFTING JACK.

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'UNITED STATES PATENT OFFICE.

FRED CLAYTON BUTLER AND EUGENE COOK, OF KALAMAZOO, MICHIGAN; SAID'BUTLER ASSIGNOR TO COOKS STANDARD TOOL COMPANY, OF KALAMAZQO, MICHIGAN, A COR- PORATION OF MICHIGAN.

Specification of Letters Patent.

Patented June 23, 1908.

Application filed August 21, 1907. Serial No. 389,524.

To all whom it may concern.-

Be it known that we, FRED CLAYTON BUT- LER'and EUGENE CooK, citizens of the United States, residing at the city and county of Kalamazoo, State of Michigan, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

This invention relates to improvements in lifting jacks. I

The main objects of this invention are: first: to provide an improved lifting jack which may be operated in any position; and second: to provide an improved lifting jack in which the parts are very simple and economical to produce and easily and quickly assembled, and, at the same time, one which is strong and durable in use.

Further objects, and objects relating to details of construction, will definitely appear from the detailed description to follow.

We accomplish the objects of our invention by the devices and means described in the following specification.

The invention is clearly defined and pointed out in theclaims. 1

A structure embodying the features of our invention is clearly illustrated in the aceompanying'drawing forming a part of this specification, in which:

Figure 1 is a side elevation of astructure embodying the features of our invention, a portion only of the operating lever being shown; Fig. 2 is an elevation, partially in section, taken on a line corresponding to the broken line 22 of Fig. 1; Fig. 3 is a side elevation, corresponding to Fig. 1, .the sideplate 5 being removed; Fig. 4; is a'vertical central section, taken on a line corresponding to line 44 of Fig. 2; Fig. 5 is an enlarg'edde tail taken one. line corresponding to the broken line 55 of Fig. 4, showing the structural details of the operating-lever and reversing-plate; Fig. 6 isan enlarged detail,

taken on a line corresponding to the broken line 66 of Fig. 2, showing the structural details of the reversing-plate; Fig. 7 is a detail side elevation corresponding to Fig. 3, with the reversing-plate in its operative position, it being shown in its inoperative posi tion in Fig. 3;. Fig. 8 is a detail vertical section corresponding to Fig. 4, ofa single-acting jack; Fig. 9 is a detail side elevation corresponding to that of Fig. 3, of a modified construction in which we adapt and apply our invention to a single-acting jack; and Fig. 10 is a detail side elevation corresponding to Fig. 9, with the reversing-plate in its opera tive position.

In .the' drawing, the sectional views are taken looking in the direction of the little arrows at the ends of the section lines, and similar numerals of reference refer to similar parts throughout the several views.

Referring to'the drawing: The frame 1 is provided with a suitable way for the rack-bar 2. The rack-bar is provided with a head 3 at its upper end, and a laterally-projecting foot 4 at its lower end. The frame is provided with a removable side-plate 5. When this plate is removed, the frame 'is opened up, so that the operating mechanism may be placed therein, the plate being detachablysecured suitable pivot pin 8, arranged transversely of the frame.

The lifting pawls 9 and 10 are mounted upon the operating-lever, one at each side of its pivot. These pawls are rovided with laterally-projecting pins 11 an 12, which are preferably cast integral with the pawls. The pawls are provided with. suitable bearing pivots 13. The pawls are held yieldingly in engagement with the rack-bar by means of the U-shaped spring 14 which is supported in an inverted position on the pin 15, projecting from the frame, the arms 0 the spring being arranged to engage the pins 11 and 12 on the pawls, as clearly appears from Figs. 3 and 7. This spring 14 holds the pawls in engagement with the rack-bar, so that the jack may be operated in any position. To reverse the j aok, that is, to adjust it so that it lowers the load, when the lever is operated, we provide a Y-shaped reversing-plate 16, the upwardlyprojecting fingers 17 and 18 of which are adapted to act upon the pins 11 and 12, respectively, of the pawls. The reversingplate ispreferably, mounted upon one of the bearings 19 for the lever pivot, which projects from the frame like a boss, as clearly a pears from Fig. 5. The reversing-plate is ocked out of its operative position by means'of the button 22, which is mounted on a suitable pivot screw as 23. This button is adapted to engage the lower end or stem of the reversing-plate, which is shaped so that as the button is turned, the reversing-plate is swung out of and locked in its inoperative position. The reversing-plate is provided with a suitable stop 21 at its end for limiting the move- -ment of the button.

The frame is provided with a suitable bosslik'eprojection, 24, on which the reversingplate spring is mounted, the pivot screw 23 for the button 22 being tapped into the boss so that the button serves to retain the spring thereon. This spring is U-shaped, its lower end being bent around the boss 24 and its arms arranged so that one engages the reversing-plate and the other the frame. This spring 25 is of sufficient strength so that in operation it overcomes the tension of the pawl springs, throwing the pawls out of en- 1gTagement with the rack when they are freed om the load. The fingers of the reversingplate, are so arranged as to act alternately on the pawls, lifting first one and then the other from enga ement with the rack, when the pawls are freed from the load. The fingers of the reversing-plate are so arranged as to actalternately on the pawls, lifting firstone and'then the other from engagement with the rack, when'the pawls are freed from the load,

as stated.

In Fig. 3, wehave illustrated the reversingplate'as in its locked or inoperative position, while in Fig. 7, it is in its operative position.

In the modified structure shown in Figs.

8, 9 and 10, we show our improvements adapted and applied to a sin le-acting jack, that is, one which is provide with only one lifting-pawl as 10, the other pawl 26 being a holding-pawl. The pawl 26 is mounted on a pivot 27 carried b the frame instead of being mounted upon t e lever, as is the pawl 9 shown in the main views. The fingers of the reversing-plate are adapted, to act upon the pins prO ecting from the pawls, substantially means of the removable side-plate.

the sameas in the main construction, but are somewhat modified in sha e toproperly engage and act upon the paw s in their changed relation.

Our improved jack is very simple andi economical in structure and the parts may be readily assembledtby an inexperienced workman. The tripping plate and the pawl spring 14 are held upon their pivots by It is obvious, however, that other means of securing them might be provided. .This means, however,-is of great advantage as it reduces to a minimum the number of arts, and, by re- "moving the side-plates,'t e parts may be -the rack-bar, as by means of the sp readily removed or slipped into place. By holding pawls yieldingly in engagement with ing described, the jack may be operate in any position. i v

Having thus described our invention, what we claim as new and desire to secure by'Letters Patent is:

1. In a lifting-jack, the combination with a frame rovided witha removable side-plate, of a rac -bar; a lever; a pivot for said lever arranged in suitable bearings insaidframe;

a pair of pawls having laterally-projecting pins thereon'mounted on said lever, one at each side of its pivot; an inverted U-shaped spring, the arms of which are arranged to engage the said pins on said pawls, whereby the into said boss; a U-shaped springmounted on said boss, with one of its arms arranged to engage said reversing-plate and the other the frame, said spring being of greater strength than said spring for said awls; a stopon saidreversing-plate for sai button; and means for securing said removable sideplate in dposition, whereby said pawl spring and sai reversingplate are retained in position.

2. In a lifting-ja c-k, the coihbination with a frame provided with a removable side-plate of a rack-bar; a lever; a pivot for said lever,

arranged 'in suitable bearings in said frame; a pair of\ pawls having laterally-projecting pins thereon mounted on said lever, one at each side of its pivot an inverted U-shaped 4 spring, the arms of which are arranged to engage said pins on said pawls, whereby the pawls are held yieldingly in engagement with said rack; a pin on said frame by which said pawl spring is supported; a Y-shapedreversing-plate mounted on one of the bearlngs for said lever ivot, arranged so that its up- WardIy-prO ecting fingem are. ada ted .to engage said pins on said pawls a utton arranged to engage the lower end of said revers- -ing-plate for swinging and looking it out ofits operative position; a boss. on said frame; a pivot-screw for said button, tapped into said boss; a U-shaped spring mounted on said boss, with one. of its arms arranged to engage said reversing-plate and the other the .frame, said spring being of greater strength than said spr1n for said awls; and means for securing said removab e side-plate in position, whereby said pawl spring and said reversing-plate are retained in osition.

3. In a lifting 'ack, the com ination with a frame, of a rac -bar; a lever; a pivot for said lever arranged in suitable bearings in said frame; a pair of pawls having laterallyprojecting pins thereon mounted on said lever, one at each side of its pivot; an inverted U-shaped spring, the arms of which are arranged to engage said pins on said its operative position; a boss onsaid frame;

a pivot-screw for said button, tapped into said boss; a U-shaped spring mounted on said hub-like projecting boss, with one of its arms arranged to engage said reversing-plate and the other the frame, said spring being of greater strength than said spring for said pawls and a stop on said reversing-plate for said button.

4. In a lifting-jack, the combination with a frame, of a rack-bar; a lever; a pivot for said lever arranged in suitable bearings in said frame; a pair of pawls having laterallyprojecting pins thereon mounted on said lever, one at each side of its pivot; an inverted U-shaped spring, the arms of which are arranged to engage said pins on said pawls, whereby the pawls are held yieldingly in engagement with said rack; a Y-shape'd reversing-plate mounted on one of the bearings for said lever pivot, arranged so that its upwardly-projecting fingers are adapted to engage said pins on said pawls; a button arranged to engage the lower end of said reversing-plate for swinging and looking it out of its operative position; a boss 011 said frame; a pivot screw for said button, tapped into said boss; and a U-shaped spring mounted on said boss, with one of its arms arranged to engage said reversing-plate and the other the frame, said sprin being of greater strength than said spring or said pawls.

5. In a lifting-jack, the combination with a frame, of a rack-bar; a lever; a pivot for said lever-arranged in suitable bearings in said frame; a pair of pawls having laterallyrojecting pins thereon mounted on said ever, one at each side of its pivot; a .U-

shaped spring, the arms of which are arranged to engage said pins on said pawls, whereby the pawls areheld yieldingly in'engagement with said rack; a Y-shaped reversing late mounted on one of the bearings for said ever pivot, arranged so that its upwardly-projecting fingers are adapted to engage said pins on said pawls; a button arranged to engage the lower end of said reversing-plate for swinging and locking it out of its operative position; a

stop on said reversing-plate for said button; and a spring arranged to act on said reversing-plate, said spring being of greater strength than said spring for said pawls, all co-acting for the purpose specified. I

6. In a lifting-jack, the combination with a frame, of a rack-bar; a lever; a pivot for said lever arranged in suitable bearings in said frame; a pair of pawls having laterally projecting pins thereon mounted on said lever, one at each side of'its pivot; a U-shaped spring, the arms of which are arranged to engage said pins on said pawls, whereby the pawls are held yieldingly in engagement with said rack; a Y-shaped reversinglate mounted on one of the bearings for said lever pivot, arranged so that its upwardly projecting fingers are adapted to engage said pins on said awls; a button arranged to engage the lbwer end of said reversing-plae for swinging and locking it out of its operative osition; and a springarranged to act on sai reversing plate, said spring being of greater strength than said. spring for said pawls, all co-actingfor the pur ose specified.

7. In a lifting-'ac the combination with a frame, of a rac -bar; a lever; a pair of alternately-acting pawls having laterally-projecting pins thereon; a U-shaped spring, the arms of which are arranged to engage said ins "on said awls, whereby the pawls are eld yielding y in enga ement with said rack; a pivotally-mounteg Y'-shaped reversing-plate arranged so that its upwardly-projecting fingers are adapted to en age said pins on said pawls; means for 100 ing said reversing-plate out of its 0 erative position, and a U-shaped spring wit one of its arms arranged to engage said reversing-plate and the other the frame, said'spring being of greater strength than said spring for said piayivls, all co-acting for the purpose speci- 8. In a lifting-jack, the combination with a frame, of a rack bar; a pair of alternatelyacting pawls having laterally-proj ecting pins thereon; a spring for holding said pawls yieldingly in engagement with said raclr; a pivotal y mounted Y shaped reversmgplate, arranged so that its upwardly-project.-

yieldin ly in engagement with said'rack; a

pivotal y-mounted reversing plate" adapted to alternately engage said pins on said-pawls a spring arranged to actuate said reversing pivotally-mounted reversing plate, said spring being of reater strength than the spring for said paw ls; and a button arranged to engage said reversing plate for locking it out of its operative positlon against the tensionof said actuating spring therefor, all co-acting for the purpose specified.

10. In a lifting jack, the combination with a frame, of a rack bar; a air of alternately acting pawls; a spring for liolding said pa-Wls yieldin ly in engagement Withsaid rack; a late adapted to alternately act on said paw s; a spring arranged to actuate said reversing plate, said spring being of greater strength than said spring for said pawls; and means for locking said reversing ate out of its operative position against t e tension of said actuating spring therefor.

In Witness whereof, We have hereunto set our hands and seals in the presence of two Witnesses.

' FRED CLAYTON BUTLER, [LS-1 EUGENE COOK. [L. s.] Witnesses:

CHARLES A. MERRELL, GERTRUDE TALLMAN. 

